Skip to content
CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-64468

binder: fix UAF in binder_free_transaction()

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: binder: fix UAF in binder_free_transaction() In binder_free_transaction(), the t->to_proc is read under the t->lock. However, once the t->lock is dropped, the to_proc can die in parallel. This leads to a use-after-free error when we attempt to acquire its inner lock right afterwards: ================================================================== BUG: KASAN: slab-use-after-free in _raw_spin_lock+0xe4/0x1a0 Write of size 4 at addr ffff00001125da70 by task B/672 CPU: 20 UID: 0 PID: 672 Comm: B Not tainted 7.1.0-rc6-00284-g8e65320d91cd #4 PREEMPT Hardware name: linux,dummy-virt (DT) Call trace: _raw_spin_lock+0xe4/0x1a0 binder_free_transaction+0x8c/0x320 binder_send_failed_reply+0x21c/0x2f8 binder_thread_release+0x488/0x7e0 binder_ioctl+0x12c0/0x29a0 [...] Allocated by task 675: __kmalloc_cache_noprof+0x174/0x444 binder_open+0x118/0xb70 do_dentry_open+0x374/0x1040 vfs_open+0x58/0x3bc [...] Freed by task 212: __kasan_slab_free+0x58/0x80 kfree+0x1a0/0x4a4 binder_proc_dec_tmpref+0x32c/0x5e0 binder_deferred_func+0xc48/0x104c process_one_work+0x53c/0xbc0 [...] ================================================================== To prevent this, pin the target thread (t->to_thread) to guarantee the target process remains alive. Undelivered transactions without a target thread are already safe, as the target process can only be the current context in those paths.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • a370003cc301d4361bae20c9ef615f89bf8d1e8a to < 5602a43f251c3d75312df91a422675fc00ca3dceaffected
  • a370003cc301d4361bae20c9ef615f89bf8d1e8a to < 0be901ab1dcc4af59b88f2e324493bb283850167affected
  • a370003cc301d4361bae20c9ef615f89bf8d1e8a to < 48aeda9f8039e4a6971d1804578efde7f2c01edaaffected
  • a370003cc301d4361bae20c9ef615f89bf8d1e8a to < 45df558c543bb5543bacc8065fd7c567740781e5affected
  • a370003cc301d4361bae20c9ef615f89bf8d1e8a to < d45ef513eed1abebfec90c3cfb6ae50c2a4182dbaffected
  • a370003cc301d4361bae20c9ef615f89bf8d1e8a to < 328ccf32acb87e8bbb1fe2b065068c574e4db2bfaffected
  • a370003cc301d4361bae20c9ef615f89bf8d1e8a to < 0f15f0f6ca5df566275ce517f257af2559528b41affected
  • a370003cc301d4361bae20c9ef615f89bf8d1e8a to < f223d27a546c1e1f48d38fd67760e78f068fe8c4affected
  • a4a3c070b8760f71c8311399fa9bfe67c8629bcaaffected
  • 22068d49d09d2b3890e19d7b2048a33340f992daaffected
  • 0e3b977a8f1be01dcfa0baae68851b1f55f2a0a9affected
  • 4.14.136 to < 4.15affected
  • 4.19.64 to < 4.20affected
  • 5.1.15 to < 5.2affected

Linux Linux

Default version status: affected

  • 5.2affected
  • 0 to < 5.2unaffected
  • 5.10.261 to ≤ 5.10.*unaffected
  • 5.15.212 to ≤ 5.15.*unaffected
  • 6.1.178 to ≤ 6.1.*unaffected
  • 6.6.145 to ≤ 6.6.*unaffected
  • 6.12.96 to ≤ 6.12.*unaffected
  • 6.18.39 to ≤ 6.18.*unaffected
  • 7.1.4 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References